001package jmri.jmrit.logixng; 002 003import jmri.NamedBean; 004 005/** 006 * DigitalExpressionBean is a DigitalExpression that also implements NamedBean. 007 * 008 * @author Daniel Bergqvist Copyright 2018 009 */ 010public interface DigitalExpressionBean extends NamedBean, DigitalExpression { 011 012 /** 013 * Constant representing an "false" state. It's returned from the method 014 * getState() if the method evaluate() returned false the last time it was 015 * called. 016 */ 017 int FALSE = 0x02; 018 019 /** 020 * Constant representing an "false" state. It's returned from the method 021 * getState() if the method evaluate() returned false the last time it was 022 * called. 023 */ 024 int TRUE = 0x04; 025 026 /** 027 * Notify property change listeners that the result of the expression 028 * has changed. 029 * @param oldResult the old last result 030 * @param newResult the new last result 031 */ 032 void notifyChangedResult(boolean oldResult, boolean newResult); 033 034}